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From West Marine:
Oxidation, not tread wear
According to rubber industry research, trailer tires need to be replaced after 3-5 years of use, even though they usually appear to have plenty of tread left. Unlike your car’s tires, it isn’t miles of driving but oxidation of the rubber that wears out the tire. Mostly, a trailer tire sits in one spot for days or weeks at a time, and may travel only 10,000 miles (or sometimes a lot less) per year. UV radiation from sunlight and ozone from exhaust cause exterior damage to the sidewalls, and oxygen from pressurized air creates unseen damage deep inside.
From Carlisle Tire:
– Time and the elements weaken a trailer tire.
– 3 to 5 years is the average life expectancy of a trailer tire,
regardless of mileage.
– It is estimated that in approximately three years, roughly
one-third of a tire's strength is gone.
– After three years, depending upon storage and conditions of
usage, consider replacing trailer tires even if they have tread
depth remaining.
– After five years, trailer tires should be replaced in all cases.
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